Portable electric lamp.



B. GOTTSGHALGK.

PORTABLE ELECTRIC LAMP. APPLICATION FILED SEPT. 11,1911. 1,022,073 Patented Apr. 2, 1912.

2 SHEETS-SHEET 1.

E. GOTTSCHALCK' PORTABLE ELECTRIC LAMP.

APPLICATION FILED SEPT. 11, 1911.

1 ,O22,073. Patented Apr. 2, 1912.

2 SHEETS-SHEET 2.

{I z 28 W W 50 7 WW): 23mm M v 544/1218 9obadaXe UNITED STATES PATENT oE IoE.

. EMIL GOTTSCHALCK, F BERLIN, GERMANY, ASSIGNOR TO THE FIRM 015 ELECTRIC- EXPORT-WERKE G. M. B. H., OF BERLIN, GERMANY.

PORTABLE ELECTRIC LAMP.

Specification of Letters Patent.

Patented Apr. 2, 1912.

Original application filed November 15, 1909, Serial No. 528,246. Divided and this application filed September 11, 1911.

To all whom it may concern Be it known that I, EMIL GOTTSCIIALOK,

engineer, a citizen of Germany, residing at' Berlin, Germany, have invented new and useful Improvements in Portable Electric Lamps, of which the following is a specification.

My invention relates to a portable electric lamp, especially designed for the use in coal. mines, where explosive gases occur and 1s a had to the accompanying drawings forming a part hereof.

In the drawings, Figures 1, 2 and 3 represent front, side and top v ews of the lamp,

Fig. 2 shows the opened cover and the magnetic lock in section, Fig. tillustrates the lamp partly in section with the cover opened. Figs. 5 to 7 illustrate modified forms of the reflector, seen from the rear, and Fig. 8 is a diagram of the electric circuit used in connection with my invention.

The casing 1 and the cover 2 of the'lamp are made of a light metal, as for instance aluminium and are connected by hinges 3. The casing has two lateral studs 4 for attaching the hoop 5 carrying the customary I hook 6. .Theends of thehoop are secured in place by means of nuts 7. Between the ends of the hoop and the casing 1 slotted disks 8 are provided, which tend to expand laterally, thus tending to hold the hoop.firmly in an angular position with respect to the easmg.

The cover 2 has a central groove for'the reception of a magnetic lock, and from the bottom of said groove extends upwardly a hook 9 shown in Fig. 2. The magnetic lock illustrated in Fig. 2 in section, comprises a lid containing an iron latch 11. The latter is guided bet-ween two members 12 within the lid 10 and is normally pressed into its locking position by a spring 13 so that the hook 9 grips over its outer end when the cover 2 and the lid 10 are depressed (Figs.

Serial No. 648,674.

1,3). Thus,the lid 10 can only be lifted and the cover 2 can only be opened, after the latch 11. has been retracted by a magnet. The lid 10 is hinged to a metal strip 14 fastened to a ring-15. The latter has two flanges 16 each extending underneath of clamping pieces 17 secured upon the casing 1. The ring 15 and also the lid 10 can thus he only removed from the casing by turning them until the flanges 16 come free of the clamps 17. The ring 15 which is shown in section in Fig. 4. serves the purpose to prevent a second ring 18 from being unscrewed from a threaded collar on the front side of the casing 1.. The ring 18 serves to hold the shade 20, the lens 21 and the reflector 22 in position. The shade 20 has a circular flange 23 positioned within the ring 18 so that it may be freely turned. has the form of a half hollow cylinder and allows the light to be so directed, that it is thrown only in the place where it is needed, while it does not blind the miner;

The lens 21 may be of any desired form adapted to increase the light. The reflector 22 is embedded andheld between a metallic ring 24 and a ring of soft material; for instance, india rubber or the like. In its interior the reflector is provided with a threaded sleeve 26 adapted to receive the threaded socket 27 of the glass bulb 28 in the customary well-known manner. The

The shade 20 itself terminal 29 of the lamp as customary is ar- I metal powder burnt into the material of the reflector, or a metallic deposit obtained by a galvanic process or the like. This strip is condu'ctively connected with the sleeve 26 and extends to the edge of the reflector, so that it makes contact with the ring 24, 'if the reflector is in place.

The strip 46 forms part of the lamp circuit, which will later be described and serves the following purpose. Supposing the lens 21 and the glass bulb of the lamp 28 are broken in which case the combustible gases within a. mine would be ignited at once, if care is not taken that in-the same moment the lamp circuit is broken and the lamp extinguished. It is'clear that with the improved lamp according to the present invention the lamp circuit will actually be broken in such. a case as a blow destroying the lens 21 will of course also break the re- In this way any damage even to the outer or.

inner periphery of the reflector "will als j cause a break inthe circuit.

The interior of the casing 1 is adapted to receive two electric cells 30, 31 preferably dry or storage cells or the like, the" first mentioned type being illustrated in Fig. 4 of the drawings. One pole is formed by a button 32, 33, being in contactwith the carbon electrode (not shown), while the other pole is'formed by the metallic cups 34, 35 of the cells themselves, as is customary in manydry cells. The cups. 34, 35 are insulated from the casing l by means of a sheet/ 36 of insulating material, as for instance vulcanite, and another similar sheet 37 is inserted between the adjacent sides, of the cups 34, 35 themselves. The: latter are rounded ontheir outer sides, while the innerones are sloping with respect to the middle plane of the lamp. Thus one cup extends over that place of the casing where the bulb 28 is arranged. Opposite the inner terminal 29 ofthe lamp socket, a double button 38 is provided "on the sheet 36, which makes contact with the lamp terminal29 and the cup 35. The other cup 36 has at the cornerof its I conductive material upon the rear of said upper side a contact 39. The cover 2 contains a sheet 40 of insulating material carrying the flat contact springs 41, 42, 43, the first one-being electrically connected with the cover 2, while the contacts 42, 43 are insulated from the cover but are mutually connected with each other by a resistance 44. The latter is arranged between the sheet 40 and the cover 2 itself. I

' When closing I the cover 2, the contact springs 41, 42, 43 touch the button 32, the contact 39 and the button 33 respectively, sothat the following circuit is closed (Fig.

. cup 35 of cell 31, button 38, lamp 28,

reflector strip 46, easing '1, cover'2, contact sprlng 41, middlev electrode 32 of cell 30, cup 34 and button 39 of thelatter zo'ntact spring \42, resistance 44, contact spring.

and middle electrode ofcell 31.. It wlll be readlly seen that. this circuit is v only closed when the cover 2 is closed. As the latter cannot be opened by the I miner himself, but only after applying an incandescent lamp, a threaded socket a strong magnet, no danger exists that sparks may be generated within the mine by opening the cover, which may have dis-.

astrous consequences for the life and health I of those employed in a mine and may-cause considerable destruction of property. The two cells 30, 31 are connected in series with the lamp 28' and resistance 44, the latter compensating the current, and preventing it from becoming too strong.

Having thus described my invention ,what

lamp, the strip the cells and the casing are situated for-the purpose of extinguishing the lamp as soon as the reflector is broken.

2. In a portable electric lamp, the combination of a metallic casing, a reflector of fragile non-conductive material, a strip of conductive material upon the rear of said reflector, a sleeve within said reflector, and

an incandescent lamp, 'a' threaded socket adapted to be secured within said sleeve, a 5

pair of battery cells within said casing, arranged within metallic cups and means to electrically connect and form a circuit'in casing are situated for the purpose of extinguishing the lamp as soon as the reflector is broken. I

3. In a portable electric lamp, the combination of a metallic casing, a reflector of fragile non-conductive material, a strip of reflector, a sleeve-within said reflector and adapted to besecured within said sleeve, a pair of battery cells within said casing, hav-- ing their adjacent walls inclined to the center plane of the casing and being arranged within metallic cups, an insulating sheet surrounding thebattery cells, a conductive button on said sheet. forming a contact between the socket of the lamp and the cup of one cell, and means to electrically connect and form a circuit in which the lamp, the strip, the cells and at for the purpose of eiitinguishing the lamp as soon as thereflectorlis broken.

n testimony -whereof-IafliX my signature in presence of'two witnesses.

, EMIL eo'rrscHALoK.

*Witnessesz" I 3 V I 4 LOTHAR WORNER,

A'UeUsr GART. I V

which the lamp, the strip, the cells and the casing are situated I 

